Can anybody help me to beat lvl 4??
Put your skill points in damage.
Buy one electric tower with a few upgrades and a shotgun tower with an upgrade. After level one upgrade the shotgun fully, after the 3rd level upgrade the electric tower and buy another electric tower as you get the money.
All of the first towers I put in the entrance side of the maze.
When you have money for machineguns place them in the middle of the maze, and put a couple of rangeboosters covering all of them. From then on it gets easy.
Thanks ctholm, I too was stuck on 4. Instead of the shotgun, I used a sniper and electric tower. I took a few lumps early, but got through it. I seemed to get hammered by the straight "reds" on wave 8 and 12, the electric towers did a nice job on them. I never thought of using the electric towers until I saw your reply.
On to level 5.
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